<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
  <head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
    <title>Exception Handling</title>
    <link rel="stylesheet" href="gettingStarted.css" type="text/css" />
    <meta name="generator" content="DocBook XSL Stylesheets V1.73.2" />
    <link rel="start" href="index.html" title="Getting Started with Berkeley DB" />
    <link rel="up" href="introduction.html" title="Chapter 1. Introduction to Berkeley DB" />
    <link rel="prev" href="databaseLimits.html" title="Database Limits and Portability" />
    <link rel="next" href="returns.html" title="Error Returns" />
  </head>
  <body>
    <div xmlns="" class="navheader">
      <div class="libver">
        <p>Library Version 11.2.5.3</p>
      </div>
      <table width="100%" summary="Navigation header">
        <tr>
          <th colspan="3" align="center">Exception Handling</th>
        </tr>
        <tr>
          <td width="20%" align="left"><a accesskey="p" href="databaseLimits.html">Prev</a> </td>
          <th width="60%" align="center">Chapter 1. Introduction to Berkeley DB </th>
          <td width="20%" align="right"> <a accesskey="n" href="returns.html">Next</a></td>
        </tr>
      </table>
      <hr />
    </div>
    <div class="sect1" lang="en" xml:lang="en">
      <div class="titlepage">
        <div>
          <div>
            <h2 class="title" style="clear: both"><a id="coreExceptions"></a>Exception Handling</h2>
          </div>
        </div>
      </div>
      <p>
        Before continuing, it is useful to spend a few moments on exception
        handling in DB with the 
        <span>java</span>.
    </p>
      <p>
        
        <span>Most</span>
        DB methods throw 
            
            <code class="classname">DatabaseException</code>
        in the event of a serious error. 
        
        <span>
            So your DB code must either catch this exception or declare it
            to be throwable. Be aware that <code class="classname">DatabaseException</code> extends 
            <code class="classname">java.lang.Exception</code>. For example:
        </span>
    </p>
      <a id="java_intro1"></a>
      <pre class="programlisting">import com.sleepycat.db.DatabaseException;

    ...
try 
{
    // DB and other code goes here
}
catch(DatabaseException e)
{
  // DB error handling goes here
} </pre>
      <p>
        You can obtain the DB error number for a
         
        <code class="classname">DatabaseException</code> 
        by using
        
        <span>
            <code class="methodname">DatabaseException.getErrno()</code>. 
            You can also obtain any error message associated with that error
            using <code class="methodname">DatabaseException.getMessage()</code>.
        </span>
    </p>
    </div>
    <div class="navfooter">
      <hr />
      <table width="100%" summary="Navigation footer">
        <tr>
          <td width="40%" align="left"><a accesskey="p" href="databaseLimits.html">Prev</a> </td>
          <td width="20%" align="center">
            <a accesskey="u" href="introduction.html">Up</a>
          </td>
          <td width="40%" align="right"> <a accesskey="n" href="returns.html">Next</a></td>
        </tr>
        <tr>
          <td width="40%" align="left" valign="top">Database Limits and Portability </td>
          <td width="20%" align="center">
            <a accesskey="h" href="index.html">Home</a>
          </td>
          <td width="40%" align="right" valign="top"> Error Returns</td>
        </tr>
      </table>
    </div>
  </body>
</html>
